According to Microsoft, a zero day flaw in Internet Explorer (IE), which impacts all versions of the browser, is being actively exploited in the wild. Reports of exploitation, according to Microsoft, seem to have criminals focused on IE versions 8 and 9.

From Networkworld:

Complicating matters, researchers at Websense have discovered that nearly 70 percent of Windows business users are susceptible to this IE zero-day exploit.

We reviewed third-party telemetry feeds from real-time global internet requests to determine the initial scope. While the exploit appears to affect all versions of IE, at the moment attacks only seem to be targeting users of IE8 and IE9 who are running Windows 7 and XP operating systems," Websense's director of security research, Alex Watson, said in a statement.